Welcome to WebmasterWorld Guest from 188.8.131.52
The user agent string is "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT; T312461)" and it does accept and handle cookies, but does not request graphics or CSS.
It sometimes remove parameters from URLs (i.e. requesting foo.php instead of the linked foo.php?id=1), and also request URLs that does not exist on the server. It does not request robots.txt.
NetRatings have not responded to my e-mail asking what this is, and searching for the IP-address did not tell me anything.
Have anyone else seen this agent? And what could this be?
Knowing this is something from Nielsen/Netratings I'm sure this bot is trying to collect demographic data of some sort, but wonder if anyone know more about it (and/or is seeing bad requests from it).